Key press trigger doesn't work once slide timeline ends

I have an interaction that requires learners to type a question mark in order to move on to the next slide. But the trigger only works if the key is pressed within the slide duration.

For example, on a slide with a 5 second duration, typing a question mark at <5 seconds will result in the slide moving on as desired. if they type a question mark after more than 5 seconds, the trigger doesn't work. 

Is this a limitation of the feature? A bug? Something I'm doing wrong with the trigger/settings?

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